[Do Not Merge] Update v4 csproj template

[jviau]

Updates v4 csproj templates:

1. Update worker SDK package to 1.17.0 (not released yet, do not merge until this is released)
2. Remove unneeded contents:
   • local.settings.json and host.json defaults are now part of the SDK itself
   • ExecutionContext using statement with alias and Properties folder includes removed
3. AspNetCore framework ref moved to separate item group.
4. Empty lines added to separate item and property groups
5. Adding Microsoft.Azure.Functions.Worker.Extensions.Http package removed.